Modern classical music is music written in the 20th century and beyond. Although much of it draws heavily on earlier forms, modern composers also experimented with rejection of long-held ideas; notably, Arnold Schoenberg questioned the traditional notions of harmony with his twelve-tone system[?], and John Cage questioned the very definition of music with his use of chance and found sounds.
... I of Spain, although often referred to as Charles V ("Carlos Quinto" or "Carlos V") in Spain and Latin America. He was the son of Philip I and Joanna of Castile ...